Rough notes for converting Githyanki to Barbarians of Lemuria.
2. Utter bastards.
3. They like sorcery as much as they like stabbing people.
4. Formerly enslaved by Illithids. Going out on a limb, the Illithids have neither forgiven nor forgotten.
5. Some of them are anti-paladins, so in addition to being sorcerers they are also religious in the 'I need to stab you for god' sense.
6. They dig swords. Probably because of the stabbing.
8. Ruled by a lich-queen. Why isn't every D&D race ruled by undead sorcerer jerks? New D&D theory: everywhere is ruled by liches, mummies, vampires, worm-things, or Joseph Curwen.
In BoL terms, Githyanki tend to be sorcerers, priests, alchemists, slaves, soldiers, and torturers. Thieves and assassins are uncommon. I'm guessing there aren't a lot of farmers. Maybe they have slaves to do that for them? That seems reasonable in a circle of abuse sort of way. Interdimensional jerk-ass slaver sorcerers who stab people for god!
All Githyanki have at least 5 arcane power points, and can travel between the Prime Material Plane and the Astral Plane at the cost of one arcane power point. When shifting between the planes, the Githyanki takes whatever they are carrying with them. If they don't have any points in sorcerer, that's all they can do with their arcane power points. If they are a sorcerer, this doesn't get them any extra points. This is Munchkin Bait. "Oh sure, you can go to the astral plane whenever you want. It's pretty sweet." If by 'pretty sweet' you mean 'swarming with Mi-Go.'
Fearsome Looks: Skull-faced-maniac-sorcerers from beyond space and time? Roll three dice when shaking people down.
Trademark Weapon: As long you've got your magic silver sword from another dimension, roll three dice in combat. This is more Munchkin Bait. Sure, you've got an awesome magic sword that cuts people in half. Did I mention that there's a black market in those things?
Sorcerous Strength : 2 extra arcane power points.
Natural Sorcerer: roll three dice for sorcerery, must take an additional flaw.
Hard to kill : 2 extra lifeblood points
Arrogant: Warrior slavers with a penchant for sorcery tend to be jerks. Roll an extra die when dealing with non-Githyanki.
Untrustworthy: Everybody knows Githyanki will turn on you as soon as it's convenient. Roll an extra die when the situation calls for someone to believe or trust you.
Madness: Sorcery and planar travel are not good for your mental health. I'll jump at any excuse to use the Call of Cthulhu insanity tables.
Cravings: Mulled wine, black lotus powder, the blood of children, whatever. You need it daily, roll three dice if you don't get your fix. All sorcerers should take this so-called flaw. How is it a flaw for a sorcerer to be a junky?
Hunted: Illithid agents are everywhere. In any city or town, there s a 1 in 6 chance an Illithid agent has spotted you and your awesome silver sword. It was probably the awesome sword that tipped them off.